1 Answer
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Here is a simple plugin with the convert function from the plugin you linked and a simple WordPress cron setup to run daily just make sure you change CUSTOM_FIELD_KEY and TAXONOMY_NAME to the actual values

Thank you for your quick response! ... Will try it.. can I change "daily" to "hourly".. it would be also easier for testing.. If I need more than one field to be converted, should I just copy/paste the whole code or just the last part "add_action..." and just change the CUSTOM_FIELD_KEY','TAXONOMY_NAME'?
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MihaAug 20 '12 at 23:04

yes you can change to hourly, as for another field simply add in the do_this_daily function another call to ` location_convert()` with the second field key.
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Bainternet♦Aug 21 '12 at 6:24